Malicious RTF — malware analysis report

Static analysis result for SHA-256 1001d800178b90c0…

MALICIOUS

RTF

15.5 KB Created: 2017-09-22 01:27:00 Authoring application: Micr osoft Word 11.0.5604 First seen: 2017-10-10
MD5: 841b6a151d51b6d2db5f7a8b1f25a120 SHA-1: 42b76a15f0a6ee8691240354cfbf97559e61de42 SHA-256: 1001d800178b90c017b29235dd5fced516da6ac13165ef44f3fe65cc06bb7bbd
222 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The RTF file contains an OLE object that is automatically linked and updated, exploiting CVE-2017-0199. This exploit is designed to fetch and execute a remote resource, indicated by the embedded URL http://192.168.0.134/ms/ms.rtf, which likely serves as a secondary payload.

Heuristics 6

  • CVE-2017-0199 (OLE2Link / remote URL Moniker) critical CVE likely CVE_2017_0199
    RTF contains a URL Moniker OLE link whose decoded target is remote. Office can fetch and process the response through the CVE-2017-0199 OLE2Link attack path, but the server-side content type is not proven statically.
  • ClamAV: Rtf.Exploit.CVE_2017_0199-6335035-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_0199-6335035-0
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://192.168.0.134/ms/ms.rtf In RTF body

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000d6b.bin rtf-objdata-decoded RTF \objdata at offset 0xD6B 2601 bytes
SHA-256: 3096136609bcf60fa27b268781d40f17ee673bde13e1465fd4b0ebfe5533633f

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